I have recieved 2 Calla Lilly tubers a month ago from a friend in Neitherlands, this is my first experience with these lovely plants , i put them in the pot and keeping them inside near a south window, outside temps were too high a month ago, presently the progress is very good, iam planning to keep them indoors untill they bloom. Iam giving them weekly water with Vinegar and fertilizer. If anybody has an experience with them please comment:

1. When shall they are supposed to bloom, which month ?
2. Will they bloom indoors ?

Yes most likely... but as you have mentioned else where that you can keep pelargoniums in summers so i guess you can keep these too... they didn't became dormant fully at my place and continue to produce leaves, became dull and rotted..